Trinity
The Christian doctrine of the Trinity holds that God is one God, and exists in the form of three coeternal and consubstantial persons: the Father, the Son, and the Holy Spirit. The three persons are distinct, yet are one "substance, essence or nature". In this context, a "nature" is what one is, whereas a "person" is who one is. The subset of Christianity that accepts this doctrine is collectively known as Trinitarianism, while the subset that does not is referred to as Nontrinitarianism. Trinitarianism contrasts with positions such as Binitarianism and Monarchianism, of which Modalistic Monarchianism and Unitarianism are subsets. While the developed doctrine of the Trinity is not explicit in the books that constitute the New Testament, the New Testament possesses a "triadic" understanding of God and contains a number of Trinitarian formulas.
